Spatial Distributions of Discharged Products of Lithium-Oxygen Batteries Revealed by Synchrotron X-ray Transmission Microscopy

Nano Letters
Mara Olivares-MarínDino Tonti

Abstract

The discharge products of ether-based Li-O2 cells were grown directly on common carbon-coated TEM grids and observed by oxidation-state-sensitive full field transmission soft X-ray microscopy (TXM). The acquired data have permitted to quantify and localize with spatial resolution the distribution of the oxygen discharge products in these samples (i.e., lithium superoxide, peroxide, and carbonates) and appreciate several compositional, structural, and morphological aspects. Most of the peroxide particles had a toroidal shape, often with a central hole usually open on only one side, and which included significant amounts of superoxide-like phases (LiO2/Li2O2 ratio between 0.2 and 0.5). Smaller particles had smaller or no superoxide content, from which we infer that abundance of soluble LiO2 may have a role in toroid formation. Significant amount of carbonates were found irregularly distributed on the electrode surface, occasionally appearing as small particles and aggregates, and mostly coating lithium peroxide particles. This suggests the formation of a barrier that, similar to the solid electrolyte interface (SEI) critical in Li-ion batteries, requires an appropriate management for a reversible operation.

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Citations

Jan 12, 2016·Nature·Jun LuKhalil Amine
Aug 22, 2018·Physical Chemistry Chemical Physics : PCCP·Zhixiao LiuFei Gao
Jul 7, 2018·Journal of Synchrotron Radiation·Aurelio Hierro-RodriguezSalvador Ferrer
Oct 23, 2020·Physical Chemistry Chemical Physics : PCCP·Zongxiang HuFeng Pan
Mar 21, 2017·Chemistry of Materials : a Publication of the American Chemical Society·Zhaolong LiMarnix Wagemaker
Oct 29, 2019·The Journal of Physical Chemistry. a·Avik HalderLarry A Curtiss
Jan 11, 2020·ACS Applied Materials & Interfaces·Qinghua CuiJiawei Wang

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